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  <!-- [css] 你知道全屏滚动的原理是什么吗？它用到了CSS的哪些属性？ -->
  https://developer.mozilla.org/zh-CN/docs/Web/API/Document/documentElement
https://developer.mozilla.org/zh-CN/docs/Web/API/Element/clientHeight
https://developer.mozilla.org/en-US/docs/Web/API/Element/mousewheel_event#The_detail_property
https://developer.mozilla.org/en-US/docs/Web/API/Touch_events
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